Cohen‘s conventions
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Is this reasonable?
Typical reported effect sizes I
e.g., Richard, Bond, & Stokes-Zoota (2003):
- Meta-meta-analysis; > 25.000 studies, > 8.000.000 participants
- mean effect r = .21 (across literature SD = .15); median = .18
Typical reported effect sizes I
e.g., Richard, Bond, & Stokes-Zoota (2003): ![]()
Typical reported effect sizes II
e.g., Bosco et al. (2015):
- 147,328 correlations from Journal of Applied Psychology and Personnel Psychology
- median effect: r = .16, mean effect r = .22 (SD = .20)
Typical reported effect sizes III
e.g., Hill et al. (2008):
- How does the effect of an intervention compare to a typical year of growth in school?
Typical reported effect sizes IV
e.g., Funder & Ozer (2019):
Typical reported effect sizes V
e.g., Aguinis, Beaty, Boik, & Pierce (2005): - Effect size of interaction from dichotomous moderator and continuous predictor ![]()
Other benchmarks I
Average placebo effect?
d = 0.24 [0.17; 0.31]!
Other benchmarks II (ES: d)